Stop including header for defunct error constants.

We no longer use the GLib error quarks in dbus/error_constants.h

BUG=None
TEST=build

Change-Id: If3e089dee8eeb2f2dca4c5596d7a0be66b37736d
Reviewed-on: https://chromium-review.googlesource.com/201761
Commit-Queue: Chris Masone <cmasone@chromium.org>
Tested-by: Chris Masone <cmasone@chromium.org>
Reviewed-by: Will Drewry <wad@chromium.org>
diff --git a/system_utils.h b/system_utils.h
index 81d5eb7..98fed56 100644
--- a/system_utils.h
+++ b/system_utils.h
@@ -16,7 +16,6 @@
 #include <base/memory/scoped_ptr.h>
 #include <base/strings/stringprintf.h>
 #include <base/time/time.h>
-#include <chromeos/dbus/error_constants.h>
 #include <chromeos/dbus/service_constants.h>
 #include <dbus/dbus-glib.h>
 #include <glib.h>
diff --git a/system_utils_impl.h b/system_utils_impl.h
index 48a1639..a66621c 100644
--- a/system_utils_impl.h
+++ b/system_utils_impl.h
@@ -18,7 +18,6 @@
 #include <base/memory/scoped_ptr.h>
 #include <base/strings/stringprintf.h>
 #include <base/time/time.h>
-#include <chromeos/dbus/error_constants.h>
 #include <chromeos/dbus/service_constants.h>
 
 namespace base {